Engine Control Systems, Electronic

The sequential multiport fuel injection (SFI) system is classified as a:

• Multi-point.
• Pulse time.
• Mass air flow controlled.

 WARNING: DO NOT SMOKE, CARRY LIGHTED TOBACCO, OR OPEN FLAME OF ANY TYPE WHEN WORKING ON OR NEAR ANY FUEL RELATED COMPONENT. HIGHLY FLAMMABLE MIXTURES ARE ALWAYS PRESENT AND MAY BE IGNITED, RESULTING IN POSSIBLE PERSONAL INJURY.

To maintain the required exhaust emission levels, the fuel metering system must be kept in good operating condition and adjusted to the specifications listed in/on the following sources:

• The applicable Section of the Powertrain Control/Emissions Diagnosis Manual.
• The applicable Section of this Group.
• The Engine/Emissions Facts Book.
• The Vehicle Emission Control Information (VECI) decal.

Additional engine performance checks are required to keep the exhaust emissions at the specified minimum pollutant level. Refer to Section 00-03 for these performance checks and their recommended intervals.

Always refer to the Master Parts List for parts usage and interchangeability before replacing:

• Throttle body (9E926).
• Component part of a throttle body .